Safety-valve.



(No Mudel.)

Patented 1an. I5, 90l. P. WHITING.

SAFETY VALVE. (Application led Sept.- 12, 1900.)

i 2 Sheets-Sheet I.

mums mans on, Hora uws., WASHINGTON u c Patented lan. I5, |901.

`P. WHITING.

SAFETY VALVE.

(Application led Sept. 12, 1900.; v

2 Sheets-Sheet 2.

(No Modelnv N-TTED STATES PATENT OFFICE.

PAUL WHITING, OF EAST. LAS VEGAS, TERRITORY OF NEW MEXICO.

SAFETY-VALVE.

SPECIFICATION forming part of Letters Patent N o. 666,171, dated January15, 1901.

Application tiled September l2, 1900. Serial No. 29,800. (No model.)

T0 @ZZ whom it may concern:

Be it known that l, PAUL WHITING, a citizen of the United States,residing at East Las Vegas, in the county of San Miguel and Territory ofNew Mexico, have invented new and useful Improvements in Safety-Valves,of which the following is a specification.

My invention relates to safety or pressurereducing valves, and moreparticularly to a valve especially designed to be used for regulatingthe pressure in an air-brake system; but it will be readily understoodthat its usefulness is not limited to this single application, but itmay be used for either air, steam, or liquid.

The object of my invention is to produce a valve of this character whichwill be efficient in operation and admits of a large range ofadjustment.

With these objects in view my invention consists of a novel combinationof parts to be hereinafter described and claimed.

In the drawings which accom pany this speci ication and of which theyform a part, Figure l is an elevation of my valve. Fig. 2 is atransverse section of the same. Fig. 3 is a perspective ofthe ferrule.Fig. 4c is a perspective of the ferrule attached to the nut, which isshown in section. Fig. 5 is an enlarged sectional detail View ot' thecatch.

Like numerals of reference denote like parts in the drawings whereverthey occur.

The numeral 1 designates the cylinder of my valve, which is secured bybolts to a headplate 2. A pipe 3 is secured to connection 4, which isformed integral with the cylinderhead 2. Screwed in the cylindenhead 2,in the upper end of the aperture 3f, connecting with the pipe 3, is avalve 5. This valve is hollow and provided with openings 6 to admit airto the cylinder at all times. The head of the valve is beveled off tomake it frustoconical in contour. This valve may be squared at thebottom to provide attachment fora wrench for convenience in taking itout. A piston 7iits snugly the cylinder 1 and is titted with apacking-ring 7, Formed integral with the piston 7 is a stem 8, whichextends upward and through thecasing9,formed integral with thecylinder 1. This stem 8 is interiorly bored at 11 for a portion of itslength, and secured inthe lower end of this bore, which is slightlyenlarged at l0 and provided with screw-th reads 12, is acouicalvalveseat13. Thisvalve-seatliscarefullyground to tit air-tight the valve5. The projecting rim 14 of the seat 13 is squared to accommodate awrench. Both the seat and valve are readily removable and may bereplaced by new ones when it is desired to do so.

Communicating with the upper end of the bore 11 are four passages 15,which establish communication between said bore and a rounded groove 16,formed in thestem 8 and extending around it. The stem 8 is turned off atits upper end, forming the part 17, which is surrounded by a stii spring18.

Formed in the casing 9, just opposite to the groove 16 when the pistonis raised, are two slots 19. These slots are smail, about oneeighth bythree-eighths ot' an inch, and serve as exhaust-ports when the piston israised. The casing.9 extendsupward and is screwthreaded at its upper endat 19. The casing 9 is also provided with a collar 20, formed integraltherewith or shrunk on it, and seated on said collar is a ring orferrule 21, which is provided with an overhanging rim 22, formedintegral therewith and fitting tightly the collar 20. The inner contourof said ferrule is ground to tit air-tight the casing 9 to preventleakage. This ferrule is provided with an opening 23 of quadrilateral ortriangular shape, which serves as an exhaust-vent when turned oppositeone of the slots 19. It is made smaller at one side in order that thevelocity ot' egress of the air lnay be regulated by turning it. Theupper edge of the ferrule 21 is provided with arim 24, having a seriesof sloping teeth 25,formed integral therewith. These teeth are engagedby catches to be hereinafter described. Thumb-pieces 26 are provided asaids in turning the ferrule. A nut 27 tits the threads 19a and isscrewed down close to, but not touching, the teeth in the -ferrule andis provided with an overhanging rim 28. Seated in said rim are twocatches 29, each provided with a nut 30 and a spring 31. These springshold said catches in a position engaging the teeth 25, thus keeping theferrule from turning unless forcibly'rotated. A graduated scale 32 iscut on the upper edge IOO of the ferrule in order that the amount theferrule is turned can be readily determined. The upper end of the nut 27is interiorly and exteriorly screw-threaded at 33 and 34, respectively.An exteriorly-threaded ring 35 fits the threads 33 and bears against thespring 18, which is held firmly between said ring 35 and shoulder 36. Anut 37 caps the whole structure. This nut 37 is made long enough and isrounded out at 38, so that the stein will not strike it when the valveis suddenly unseated.

I may also provide my valve with a whistle attachment. (Shown in Fig.l.) This attachment is made very conveniently as follows: The side wallof the cylinder has a tortuous passage 39 formed in it which opens at 40into the interior of the cylinder and at 41 into the open air. The end40 is positioned so that it is always covered by the piston when thevalve is seated and is opened when the valve is unseated. The opening 41is provided with a small whistle 42. It is obvious that by thisarrangement the whistle will be blown every time the valve is unseated.

In operation the spring 18 is adjusted by means of the nut at its upperend to a certain predetermined tension. The spring will therefore holdthe piston normally down and seated on the seat 13 and covering thewhistlepassage. When the pressure of the air in the pipe 3 rises inexcess of the tension of the spring, the piston will be raised, sincethe air has free access to it by way of the passage 6. The air will thusescape by way of bore 11, passages l5, slots 19, and-opening 23. Theescape of air can now be regulated or stopped entirely by turning theferrule 21. As soon as the pressure of the air has been reduced to thatof the tension of the spring the valve will be seated again and the owstopped. The Whistle will start to blow as soon as the valve is unseatedand will continue to blow until it is again seated.

It will be seen from the foregoing that my valve will automatically openand reduce the pressure in the pipes whenever it gets too high, and theamount of pressurein the pipes can he regulated at will by adjusting thetension of the spring.

Having thus described my invention, what I claim as new, and wish tosecure byLetters Patent, is

1. The combination with the cylinder, of the piston fitting saidcylinder, the longitudinally-bored stem secured to said piston, thevalve-seat formedin the end of said bore, the valve fitting said seat,and a spring surrounding said stein.

2. The combination of the cylinder, the piston fitting said cylinder,the bored stein secured to said piston, the groove in said stem, thespring surrounding said stem, the casing secured to said cylinder, theslots in said casing, the ferrule adapted to cover said slots, the valvesecured to said piston-head, and the valve-seat formed in the said stem.

3. The combination with the cylinder, of the piston fitting saidcylinder, the apertured valve secured in said cylinder, thelongitudinally-bored stem secured to said piston, the valve-seat formedin the lower end of said bore and adapted to fit said valve, the groovein said stern, the passage comin unicating with said bore and saidgroove, the slots formed in the casing secured to said cylinder, and thespring surrounding said stem.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

PAUL WHITING.

Witnesses:

CHAs. F. MILLER, W. B. BUNKER.

